Description
（8）由现场电脑操纵，还可挂到上位机，接同一总线的上一级计算机。
（9）局域网，再可与internet相通。
（10）改变传统的信号标准、通信标准和系统标准入企业管理网。
（11）制造商：美Honeywell、Smar、Fisher—Rosemount、AB/Rockwell、Elsag—Bailey、Foxboro、Yamatake、日Yokogawa、欧Siemens、GEC—Alsthom、Schneider、proces—Data、ABB等。
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